{
  "manageEntity": {
    "action": "Save",
    "entityId": "780260706",
    "entityType": "Track",
    "nonce": "0x6d00d2760731ce4d50243e9e2af7cc8255422406c970af898bb2c8fced81d0db",
    "signature": "0xaf7379d9c7462dd7529c28b4fce5afb3e82170ec5890c8116d5fe61e50858c1a139020c91e85bd6d26b7aab51aef0b18ffeb42eb89d48900106efacb428e49f91b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}